ULTRASLOW POSITIVE-MUON GENERATION BY LASER IONIZATION OF THERMAL MUONIUM FROM HOT TUNGSTEN AT PRIMARY PROTON-BEAM - NAGAMINE, K; MIYAKE, Y; SHIMOMURA, K; BIRRER, P; MARANGOS, JP; IWASAKI, M; STRASSER, P; KUGA, T (PHYSICAL REVIEW LETTERS, 1995)